Compressor for refrigerating apparatus



J. H. DENNEDY.

'COMPRESSOR FOR REFRIGER'ATING APPARATUS.

APPLICATION FILED AUG.20, 1920.

1,366,879. Patented Jan. 25, 1921..

- N t yN 5L UNITED "A sTiaxTlazs PATENT oFFlcE.

JAMES H. DENNEDY, 0I' DETROIT, MICHIGAN, AssIGNoR 'ro' -K ELVINATON, convolu- 'IIoN, oF'DE'rnoI'r, MICHIGAN, A CORPORATION 0F DELAWARE.

COLIPRESSOR -FOR REFBIGERATING A-PPARATU-S.

To all wlw/mit may concern:

Be it known that I, JAMES H. DENNEDY, a citizen of the United States, residin at Detroit, in the county of Wayne and tate of Michigan,.have invented certain'new and useful Improvements in Compressors for Refrigerating Apparatus, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings. This invention relates to compressors for gaseous `iuid particularly such as are usedin refrigerating apparatus, and has especlal reference to refrigerating apparatus of the domestic type although not necessarily limited thereto. While it isvwell known that the requirements of all refrigerating ma- Chillery arezsevere, owing tfo .the offensive' and corrosive nature of the fiuids employed, it is a fact that a device' for domestic use has peculiarly severe requirements owing to the irregularity of its use, the lack of skilled or constant attention, and the high pressures to which it is occasionally subjected. Such a device `is often left unused for long periods of time, such as'duringthe winter months, yet the' demand is made that it shall start instantly and operate perfectly 'y at the end of that time; alsofowing totem` porarynvacation of premlsesndlscontmuance of electric current, or for accldental reasons,

such apparatus is frequently left idle for extended periods in hot weather as a result of whichthe vrefrigerant fluid, which under ordinar operating conditions exlsts largely in the iquefied state, becomeswholly gasified with the production ofv internal pres= sure far beyond those which would normally occur. Notwithstanding these extreme drawbacks no leakage must occur, 'either'of air inward or o'f'refrigera'nt outward,and no corrosion must result for otherwise the inachine mi ht not run when called-on.`

.One o the most fruitful sources of trou' ble in previous refrigerating systems has originated at the point where the ma1ndr1v+4 ing shaft of the compressor` projects through the wall of thecasmg in-rwhichit. revolves, since it is at this pomt that leakage of refrigerant or lubricant fluid, inlet f of air, and corrosionof the'parts'has most frequently occurred. The ob]t s of the` present invention are the provision of a compressor of such construction as to overcome and avoid such leakage without such;

. Specification of Letters Patent. .Patented.Ja,n, 25, 1921. Application led August 20, 1920.' Serial No.' 404,937

nicety of fit as fwill impede o eration of the compressor; the provision o a compressor of such nature and construction as always to remain ti ht under all conditions of temperature an pressure; the provision of a compressor -of such design as to be more easily constructed and assembled than previous devices; the provision of a new and improved construction of'sealing and bear-y vthrou h a preferred design of compressor embo ying my improvements.

The particular compressor shown is ofV the cylinder type althou h this is not necessary to my invention. n the present embodiment the cylinder block 1 is cast integral with the hollow crank case 2, whose end-is formed' with a circular opening 3 surrounded by the seat 4 to which is bolted the bearing member 5. JLocated in the inner end of this bearing member is a bearing 7 of-any suitable type which esupports the crank` shaftgS. The outer end of the bearing member is formed with an enlarged re'- cess 9 .andin the present embodimentlthe outer end of the crank shaft is reduced in size .where it` .passes through this recess as shown at 10, therebyproducing a shoulder 11. The extreme outer end of the shaft is formed with a'screw threaded stud 12 for the reception of a vnut 13 whereby the drive i wheel 14 is held in place, relative rotation between the wheel and shaft being prevented by the key 15. f l

A' Slidabl mountedupon the reduced polv tion 10 othe shaft is a sleeve 16 having at one end an enlarged abrupt shoulder'l and at the otherv end a removable bearing ring .'18 hermetically clamped in 'place-by a suitable nut'l'f9 which is' threaded upon a re`- duced extension of the sleeve.

he inner end of the-sleeve ,is provided with 'a suitable .11o

lpacking sleeve is held against the shoulder 11 through the agency ofthe nut 13, although it is obvious that other expedients could be employed, such for example as a nut between the fiy wheel andysleeve. The inner face of the ring 18 constitutes a shoulder 21 opposed to the shoulder 17 and it is immaterial which end of the sleeve is presented to the shoulder 11 provided only that suitable packing means be employed between the sleeve and shaft.

Embracing the sleeve 16 between the shoulders 17 and 21 are two supporting rings 25-25 having secured to their outer faces and preferably in suitable recesses the bearing and sealing rings 26-26 which are made of some anti-friction substance which will run without oil and also resist the corrosive action of the refrigerant. Between the rings 25 there is interposed the expansion spring 27 and connecting these rings outside of the spring is the expansible sheath 28, which is hermetically attached thereto and is formed at some oint between its ends with a laterally progecting annular Flange 29 which overlies the end of the member 5 and.

is tightly clamped thereto by means of the riigg7 30.

ith the foregoing construction it will be clear that leakage in either direction will be absolutel prevented; even though a suiiicient di erence of pressure between the exterior and interior should arise as to overcome the tension of the spring 27 and force gas past one of the rings, its edect upon the rearward face of the other ring would be to increase its tightness and thus prevent the possibility of any leakage. The loca- K tion of the llange 29 at the-point described y thus permitting such relative movement such causes a very exible connection between the sealing device and the machine frame as would be required by slightinaccuracies in workmanship or slight bending of the shaft. 'lihe device can be removed as a whole and without danger and changes. in detail and replaced-as a whole without dilliculty of disruption of the parts so long as the nut 19 is not misplaced; by reason of the design of the parts this will 'be diicult to accomplish, since the nut and sleeve are preferably made without tool engaging provisions. The rings 26-26 are preferably made of a suitable anti-fricltion metal, preferably graphite-bronze suoli as that described in Letters Patent of E. J. Copeland, No. 1,329,348, issued January 27, 1920; although other substances such as a good grade of Babbitt metal, can be employed.

It will therefore be understood that many and construction can be made within the scope of my invention, `vherefore I do not limit myself to the pai'- ticular features of construction or arrangement wherein illustrated or described except as the same are specifically pointed out in the claims hereto annexed.

Having thus described my invention, what I claim is:

l. In a compressor for refrigerating machinery, in combination, a casing having an opening, a shaft projecting through said opening, and having a shoulder, a bearing surrounding the larger portion of said shaft, a sleeve surrounding the smaller portion of said shaft, and itself formed exteriorly with longitudinally-spaced, oppositely-disposed, annular shoulders, means hermetically clamping said sleeve against said lirst shoulder, a pair of spaced sealing rings surrounding said sleeve between said shoulders, an expansionspring located between said rings and pressing them against said last mentioned shoulders. a longitudinally ex `oansible sheath connecting said rings, and means securing said sheath hermetically to said casing.

3. In a compressor for reieiigerating machinery, in combination, a casing having a recessed opening, a rotatable member located in said recess and having a pair of longitui'inally-spaced oppositely-disposed, annular shoulders. a pair of space sealing rings surrounding said member between said shoulliers. an expansion spring located between said rings and pressii e; them against said shoulders, a longitudine ly efrpansible sheath :onnecting said rings. and means securing said sheath liermetically to said casing.

I3. In a compressor for ieiirigerating nia-- ehinery, in combination, e casing having an opening in its wall. a bearing member secured in said opening, a shaft journaled in said member, a sleeve surrounding said shaft and having a pair of longitudinally spaced ing said sleeve between said shoulders, inea-ns including a flexible diaphragm whereby each of said rings is hermetically secured to said casing, and an expansion spring between said rings and pressing the seme against their respective shoulders.

i. In a compressor for reifrigerating machinery, in combina-tion, a casing having a recess in its wall, a rotatable member in said recess, and having a pair of longitudinallyspaced, opposed, annular shoulders, a air of anti-friction sealing rings surroun ing said member between said shoulders, means including a flexible diaphragm whereby each of said rin s is hermetically secured to said casing, an an expansion spring between said rings and pressing the same against their respective shoulders.

' 5. In a compressor for refrigerating machinery, in combination, a casing having an aperture in its wall, a bearing member secured in said aperture, a shaft journaled in said bearing member, a sleeve surrounding l said shaft and formed with two oppositely facing exterior annular shoulders, means securing said sleeve hermetically to said shaft, a pair of anti-friction sealing rings surrounding said sleeve,.one adjacent to each shoulder, means including a flexible diaphragm whereby each of' said rings is flexibly attached to said bearing member, and

spring means forcing each of said sealing rings against its shoulder.

6. In a compressor for refrigerating ma chinery, in combination, a casing having an aperture in its Wall, a shaft projecting through said aperture, a sleeve hermetically clamped to said shaft and formed at Aone end with an external annular shoulder, a rin hermetically secured to the other end of sai aperture in its Wall,l a bearing member secured in said aperture, a shaft journaled in said bearing member,` a sleeve surrounding said shaft and formed with 'two oppositely facing exterior annular shoulders, means securing said sleeve hermetically to said shaft,

a pair of anti-friction sealing rings surrounding said sleeve, oney adjacent to each shoulder, a longitudinally flexible sheath connecting said rings, a flexible flange securing said sheath hermetically to said cas-- ing, and spring4 means forcingeach of said rings toward its respective shoulder.

8. In a compressor for refrigerating apparatusin combination, a casing having a hole in its Wall and a seat surrounding said hole, a rotatable member traversing said hole and having adjacent-to said seat a pair of oppositely-facing, exterior, annular shoulders, a pair of sealing rings located one adjacent each ofsaid shoulders, means includ- Aing a flexible diaphragm whereby said `rings are secured to said seat, and spring means forcing each of said rings against its respective shoulder.

9. In aV compressor paratus, aperture in its wall, a rotatable member projecting through said aperture and having a pair of oppositely-facmg, exterior, annular for refrigerating" ap 4 shoulders, a pair of sealing rings located one adjacent each of said shoulders, means mcluding a longitudinally flexible Sheath-connecting said rings together, means hermetically connecting said sheath to said casing, and spring means their respective shoulders. p

'In testimony whereof I hereunto aixmy signature.

JAMES H. .DENNEDY' Witness:

A. H. oss.

in combination, a `casing having an forcing said rings against Y 

